package map;

import java.util.HashMap;
import java.util.Hashtable;

/**
 * @author ypz
 * @date 2021/9/17 18:10
 */
public class MapKnow {
    public static void main(String[] args) {
        //map的put方法
        HashMap<Object, Object> objectObjectHashMap = new HashMap<>();
        objectObjectHashMap.put(null,null);
        Hashtable<Object, Object> objectObjectHashtable = new Hashtable<>();
        objectObjectHashtable.put(null,null);

    }
}
